Create README.md

README.md

@@ -0,0 +1,45 @@
+# kargs
+All-in-one tool for building cli applications in Kotlin
+
+# Installation
+```kotlin
+/** build.gradle.kts */
+repositories {
+  mavenCentral()
+}
+
+dependencies {
+  implementation("org.kargs:kargs:version")
+}
+```
+
+# Usage
+
+## Parser
+```kotlin
+// Main.kt
+import org.kargs.*
+
+fun main(args: Array<String>) {
+  val parser = Parser("program name")
+
+  // Register subcommands
+  parser.subcommands(
+    TestCommand1(),
+    TestCommand2(),
+    ...
+  )
+
+  parser.parse(args)
+```
+
+## Subcommand
+```kotlin
+// Subcommand.kt
+import org.kargs.*
+
+class TestCommand : Subcommand("name", "description", aliases = listOf("alias1", "alias2")) {
+  override fun execute() {
+    println("Logic")
+  }
+}

build.gradle.kts

@@ -4,7 +4,7 @@ plugins {
 }
 
 group = "org.kargs"
-version = "1.0.2"
+version = "1.0.8"
 
 repositories {
     mavenCentral()
@@ -12,8 +12,8 @@ repositories {
 
 dependencies {
     testImplementation(kotlin("test"))
-    implementation(kotlin("stdlib"))
+    // implementation(kotlin("stdlib"))
-    implementation(kotlin("reflect"))
+    // implementation(kotlin("reflect"))
 
     // JUnit 5 testing dependencies
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.10.0")
@@ -68,3 +68,4 @@ mavenPublishing {
         }
     }
 }
+

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.2.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

src/main/kotlin/org/kargs/ArgType.kt

@@ -1,5 +1,7 @@
 package org.kargs
 
+import java.io.File
+
 /**
  * Sealed class representing different argument types with conversion and validation logic
  */
@@ -49,7 +51,7 @@ sealed class ArgType<T>(val typeName: String) {
     /**
      * Create a constrained integer type with min/max bounds
      */
-    class IntRange(private val min: kotlin.Int, private val max: kotlin.Int) : ArgType<kotlin.Int>("Int") {
+    class IntRange(val min: kotlin.Int, val max: kotlin.Int) : ArgType<kotlin.Int>("Int") {
         override fun convert(value: String): kotlin.Int {
             val intValue = value.toIntOrNull() ?: throw ArgumentParseException("`$value` is not a valid integer")
             if (intValue !in min..max) {
@@ -64,7 +66,7 @@ sealed class ArgType<T>(val typeName: String) {
     /**
      * Create an enum type from list of valid choices
      */
-    class Choice(private val choices: List<kotlin.String>) : ArgType<kotlin.String>("Choice") {
+    class Choice(val choices: List<kotlin.String>) : ArgType<kotlin.String>("Choice") {
         override fun convert(value: String): kotlin.String {
             if (value !in choices) {
                 throw ArgumentParseException("`$value` is not a valid choice. Valid options: ${choices.joinToString(", ")}")
@@ -75,6 +77,51 @@ sealed class ArgType<T>(val typeName: String) {
         override fun getValidationDescription(): String = "one of: ${choices.joinToString(", ")}"
     }
 
+    /**
+     * Optional value type - can be used as flag or with value
+     */
+    class OptionalValue(val defaultWhenPresent: String = "true") : ArgType<kotlin.String>("OptionalValue") {
+        override fun convert(value: String): String = value
+
+        override fun getValidationDescription(): String = "optional value or flag"
+    }
+
+    /**
+     * File path type with existence and permision validation
+     */
+    class FilePath(
+        val mustExist: Boolean = false,
+        val mustBeFile: Boolean = false,
+        val mustBeDirectory: Boolean = false,
+        val mustBeReadable: Boolean = false,
+        val mustBeWritable: Boolean = false
+    ) : ArgType<java.io.File>("File") {
+        override fun convert(value: String): File = File(value)
+
+        override fun validate(value: File): Boolean {
+            return when {
+                mustExist && !value.exists() -> false
+                mustBeFile && !value.isFile -> false
+                mustBeDirectory && !value.isDirectory -> false
+                mustBeReadable && !value.canRead() -> false
+                mustBeWritable && !value.canWrite() -> false
+                else -> true
+            }        
+        }
+
+        override fun getValidationDescription(): String {
+            val conditions = mutableListOf<String>()
+            if (mustExist) conditions.add("must exist")
+            if (mustBeFile) conditions.add("must be a file")
+            if (mustBeDirectory) conditions.add("must be a directory")
+            if (mustBeReadable) conditions.add("must be readable")
+            if (mustBeWritable) conditions.add("must be writable")
+
+            return if (conditions.isEmpty()) "file path" else "file path (${conditions.joinToString(", ")})"
+        }
+    }
+
+
     companion object {
         val String: ArgType<kotlin.String> = StringType
         val Int: ArgType<kotlin.Int> = IntType
@@ -90,5 +137,35 @@ sealed class ArgType<T>(val typeName: String) {
          * Create a choice type from valid options
          */
         fun choice(vararg options: kotlin.String) = Choice(options.toList())
+
+        /**
+         * Create an optional value or flag
+         */
+        fun optionalValue(defaultWhenPresent: String = "true") = OptionalValue(defaultWhenPresent)
+
+        /**
+         * File that must exist and be a regular file
+         */
+        fun existingFile() = FilePath(mustExist = true, mustBeFile = true)
+
+        /**
+         * Directory that must exist
+         */
+        fun existingDirectory() = FilePath(mustExist = true, mustBeDirectory = true)
+
+        /**
+         * File that must exist and be readable
+         */
+        fun readableFile() = FilePath(mustExist = true, mustBeFile = true, mustBeReadable = true)
+
+        /**
+         * File that must be writable (can be created if doesn't exist)
+         */
+        fun writableFile() = FilePath(mustBeWritable = true)
+
+        /**
+         * Any file path (no validation)
+         */
+        fun filePath() = FilePath()
     }
 }

src/main/kotlin/org/kargs/Colors.kt

@@ -0,0 +1,342 @@
+package org.kargs
+
+object Colors {
+    enum class Color(val code: String) {
+        RESET("\u001B[0m"),
+
+        // Base colors
+        BLACK("\u001B[30m"),
+        RED("\u001B[31m"),
+        GREEN("\u001B[32m"),
+        YELLOW("\u001B[33m"),
+        BLUE("\u001B[34m"),
+        MAGENTA("\u001B[35m"),
+        CYAN("\u001B[36m"),
+        WHITE("\u001B[37m"),
+        GRAY("\u001B[90m"),
+
+        // Bright colors
+        BRIGHT_BLACK("\u001B[90m"),
+        BRIGHT_RED("\u001B[91m"),
+        BRIGHT_GREEN("\u001B[92m"),
+        BRIGHT_YELLOW("\u001B[93m"),
+        BRIGHT_BLUE("\u001B[94m"),
+        BRIGHT_MAGENTA("\u001B[95m"),
+        BRIGHT_CYAN("\u001B[96m"),
+        BRIGHT_WHITE("\u001B[97m"),
+
+        // Extended 256-color palette (some popular ones)
+        ORANGE("\u001B[38;5;208m"),
+        PURPLE("\u001B[38;5;129m"),
+        PINK("\u001B[38;5;205m"),
+        LIME("\u001B[38;5;154m"),
+        TEAL("\u001B[38;5;80m"),
+        NAVY("\u001B[38;5;17m"),
+        MAROON("\u001B[38;5;88m"),
+        OLIVE("\u001B[38;5;100m"),
+        SILVER("\u001B[38;5;248m"),
+        GOLD("\u001B[38;5;220m"),
+        CORAL("\u001B[38;5;209m"),
+        SALMON("\u001B[38;5;210m"),
+        KHAKI("\u001B[38;5;185m"),
+        VIOLET("\u001B[38;5;177m"),
+        INDIGO("\u001B[38;5;54m"),
+        TURQUOISE("\u001B[38;5;80m"),
+        CRIMSON("\u001B[38;5;196m"),
+        FOREST_GREEN("\u001B[38;5;22m"),
+        ROYAL_BLUE("\u001B[38;5;21m"),
+        DARK_ORANGE("\u001B[38;5;166m"),
+        LIGHT_GRAY("\u001B[38;5;250m"),
+        DARK_GRAY("\u001B[38;5;240m"),
+        
+        // Pastel colors
+        PASTEL_PINK("\u001B[38;5;217m"),
+        PASTEL_BLUE("\u001B[38;5;153m"),
+        PASTEL_GREEN("\u001B[38;5;157m"),
+        PASTEL_YELLOW("\u001B[38;5;229m"),
+        PASTEL_PURPLE("\u001B[38;5;183m"),
+        PASTEL_ORANGE("\u001B[38;5;223m"),
+
+        // Styles
+        BOLD("\u001B[1m"),
+        DIM("\u001B[2m"),
+        ITALIC("\u001B[3m"),
+        UNDERLINE("\u001B[4m"),
+        BLINK("\u001B[5m"),
+        REVERSE("\u001B[7m"),
+        STRIKETHROUGH("\u001B[9m"),
+
+        // Background colors
+        BG_BLACK("\u001B[40m"),
+        BG_RED("\u001B[41m"),
+        BG_GREEN("\u001B[42m"),
+        BG_YELLOW("\u001B[43m"),
+        BG_BLUE("\u001B[44m"),
+        BG_MAGENTA("\u001B[45m"),
+        BG_CYAN("\u001B[46m"),
+        BG_WHITE("\u001B[47m"),
+
+        // Semantic presets
+        ERROR("${BRIGHT_RED.code}${BOLD.code}"),
+        WARN("${YELLOW.code}${BOLD.code}"),
+        INFO(CYAN.code),
+        DEBUG("${DIM.code}${GRAY.code}"),
+        SUCCESS("${BRIGHT_GREEN.code}${BOLD.code}"),
+        
+        // File/UI semantic colors
+        FILENAME("${BRIGHT_BLUE.code}${BOLD.code}"),
+        HEADING("${BRIGHT_MAGENTA.code}${BOLD.code}"),
+        SUBHEADING("${MAGENTA.code}${BOLD.code}"),
+        EMPHASIS("${BRIGHT_YELLOW.code}${BOLD.code}"),
+        HIGHLIGHT("${BG_YELLOW.code}${BLACK.code}"),
+        LINK("${BRIGHT_CYAN.code}${UNDERLINE.code}"),
+        CODE(BRIGHT_GREEN.code),
+        COMMENT("${DIM.code}${GRAY.code}"),
+        KEYWORD(BRIGHT_MAGENTA.code),
+        STRING(GREEN.code),
+        NUMBER(BRIGHT_BLUE.code),
+        OPERATOR(BRIGHT_RED.code),
+        
+        // Status colors
+        ACTIVE(BRIGHT_GREEN.code),
+        INACTIVE("${DIM.code}${GRAY.code}"),
+        PENDING(YELLOW.code),
+        FAILED(BRIGHT_RED.code),
+        PASSED(BRIGHT_GREEN.code),
+        SKIPPED(BRIGHT_YELLOW.code),
+        
+        // UI Elements
+        BORDER(DARK_GRAY.code),
+        MENU_ITEM(BRIGHT_WHITE.code),
+        SELECTED("${BG_BLUE.code}${BRIGHT_WHITE.code}"),
+        DISABLED("${DIM.code}${GRAY.code}"),
+        
+        // Log levels
+        TRACE("${DIM.code}${LIGHT_GRAY.code}"),
+        VERBOSE(GRAY.code),
+        FATAL("${BG_RED.code}${BRIGHT_WHITE.code}${BOLD.code}");
+
+        fun bold() = DerivedColor("${BOLD.code}$code")
+        fun dim() = DerivedColor("${DIM.code}$code")
+        fun italic() = DerivedColor("${ITALIC.code}$code")
+        fun underline() = DerivedColor("${UNDERLINE.code}$code")
+        fun strikethrough() = DerivedColor("${STRIKETHROUGH.code}$code")
+        fun reverse() = DerivedColor("${REVERSE.code}$code")
+        fun blink() = DerivedColor("${BLINK.code}$code")
+        
+        // Combine with background
+        fun onBackground(bgColor: Color) = DerivedColor("${bgColor.code}$code")
+    }
+
+    /** Wrapper for modified colors */
+    class DerivedColor(val combinedCode: String) {
+        fun bold() = DerivedColor("${Color.BOLD.code}$combinedCode")
+        fun dim() = DerivedColor("${Color.DIM.code}$combinedCode")
+        fun italic() = DerivedColor("${Color.ITALIC.code}$combinedCode")
+        fun underline() = DerivedColor("${Color.UNDERLINE.code}$combinedCode")
+        fun strikethrough() = DerivedColor("${Color.STRIKETHROUGH.code}$combinedCode")
+        fun reverse() = DerivedColor("${Color.REVERSE.code}$combinedCode")
+        fun blink() = DerivedColor("${Color.BLINK.code}$combinedCode")
+    }
+
+    // Global enable/disable
+    private var globalColorsEnabled = true
+    fun setGlobalColorsEnabled(enabled: Boolean) { globalColorsEnabled = enabled }
+    fun areGlobalColorsEnabled(): Boolean = globalColorsEnabled
+
+    // colorize() overloads
+    fun colorize(text: String, color: Color): String =
+        if (globalColorsEnabled) "${color.code}$text${Color.RESET.code}" else text
+
+    fun colorize(text: String, color: DerivedColor): String =
+        if (globalColorsEnabled) "${color.combinedCode}$text${Color.RESET.code}" else text
+
+    // RGB color support (for terminals that support it)
+    fun rgb(r: Int, g: Int, b: Int): DerivedColor = 
+        DerivedColor("\u001B[38;2;$r;$g;${b}m")
+    
+    fun bgRgb(r: Int, g: Int, b: Int): DerivedColor = 
+        DerivedColor("\u001B[48;2;$r;$g;${b}m")
+
+    // Hex color support
+    fun hex(hexColor: String): DerivedColor {
+        val hex = hexColor.removePrefix("#")
+        val r = hex.take(2).toInt(16)
+        val g = hex.substring(2, 4).toInt(16)
+        val b = hex.substring(4, 6).toInt(16)
+        return rgb(r, g, b)
+    }
+
+    // --------------------------------------------------------
+    // Semantic convenience helpers
+    // --------------------------------------------------------
+    fun filename(text: String) = colorize(text, Color.FILENAME)
+    fun heading(text: String) = colorize(text, Color.HEADING)
+    fun subheading(text: String) = colorize(text, Color.SUBHEADING)
+    fun emphasis(text: String) = colorize(text, Color.EMPHASIS)
+    fun highlight(text: String) = colorize(text, Color.HIGHLIGHT)
+    fun link(text: String) = colorize(text, Color.LINK)
+    fun code(text: String) = colorize(text, Color.CODE)
+    fun comment(text: String) = colorize(text, Color.COMMENT)
+    fun keyword(text: String) = colorize(text, Color.KEYWORD)
+    fun string(text: String) = colorize(text, Color.STRING)
+    fun number(text: String) = colorize(text, Color.NUMBER)
+    fun operator(text: String) = colorize(text, Color.OPERATOR)
+    
+    // Status helpers
+    fun active(text: String) = colorize(text, Color.ACTIVE)
+    fun inactive(text: String) = colorize(text, Color.INACTIVE)
+    fun pending(text: String) = colorize(text, Color.PENDING)
+    fun failed(text: String) = colorize(text, Color.FAILED)
+    fun passed(text: String) = colorize(text, Color.PASSED)
+    fun skipped(text: String) = colorize(text, Color.SKIPPED)
+    fun success(text: String) = colorize(text, Color.SUCCESS)
+    
+    // Log level helpers
+    fun trace(text: String) = colorize(text, Color.TRACE)
+    fun verbose(text: String) = colorize(text, Color.VERBOSE)
+    fun fatal(text: String) = colorize(text, Color.FATAL)
+
+    // --------------------------------------------------------
+    // Extended color convenience helpers
+    // --------------------------------------------------------
+    fun orange(text: String) = colorize(text, Color.ORANGE)
+    fun purple(text: String) = colorize(text, Color.PURPLE)
+    fun pink(text: String) = colorize(text, Color.PINK)
+    fun lime(text: String) = colorize(text, Color.LIME)
+    fun teal(text: String) = colorize(text, Color.TEAL)
+    fun navy(text: String) = colorize(text, Color.NAVY)
+    fun maroon(text: String) = colorize(text, Color.MAROON)
+    fun olive(text: String) = colorize(text, Color.OLIVE)
+    fun silver(text: String) = colorize(text, Color.SILVER)
+    fun gold(text: String) = colorize(text, Color.GOLD)
+    fun coral(text: String) = colorize(text, Color.CORAL)
+    fun salmon(text: String) = colorize(text, Color.SALMON)
+    fun khaki(text: String) = colorize(text, Color.KHAKI)
+    fun violet(text: String) = colorize(text, Color.VIOLET)
+    fun indigo(text: String) = colorize(text, Color.INDIGO)
+    fun turquoise(text: String) = colorize(text, Color.TURQUOISE)
+    fun crimson(text: String) = colorize(text, Color.CRIMSON)
+    fun forestGreen(text: String) = colorize(text, Color.FOREST_GREEN)
+    fun royalBlue(text: String) = colorize(text, Color.ROYAL_BLUE)
+    fun darkOrange(text: String) = colorize(text, Color.DARK_ORANGE)
+    fun lightGray(text: String) = colorize(text, Color.LIGHT_GRAY)
+    fun darkGray(text: String) = colorize(text, Color.DARK_GRAY)
+
+    // Pastel helpers
+    fun pastelPink(text: String) = colorize(text, Color.PASTEL_PINK)
+    fun pastelBlue(text: String) = colorize(text, Color.PASTEL_BLUE)
+    fun pastelGreen(text: String) = colorize(text, Color.PASTEL_GREEN)
+    fun pastelYellow(text: String) = colorize(text, Color.PASTEL_YELLOW)
+    fun pastelPurple(text: String) = colorize(text, Color.PASTEL_PURPLE)
+    fun pastelOrange(text: String) = colorize(text, Color.PASTEL_ORANGE)
+
+    // --------------------------------------------------------
+    // Original convenience helpers (keeping all existing ones)
+    // --------------------------------------------------------
+    fun bold(text: String) = colorize(text, Color.WHITE.bold())
+    fun dim(text: String) = colorize(text, Color.GRAY)
+    fun black(text: String) = colorize(text, Color.BLACK)
+    fun red(text: String) = colorize(text, Color.RED)
+    fun green(text: String) = colorize(text, Color.GREEN)
+    fun yellow(text: String) = colorize(text, Color.YELLOW)
+    fun blue(text: String) = colorize(text, Color.BLUE)
+    fun magenta(text: String) = colorize(text, Color.MAGENTA)
+    fun cyan(text: String) = colorize(text, Color.CYAN)
+    fun white(text: String) = colorize(text, Color.WHITE)
+    fun gray(text: String) = colorize(text, Color.GRAY)
+
+    fun brightBlack(text: String) = colorize(text, Color.BRIGHT_BLACK)
+    fun brightRed(text: String) = colorize(text, Color.BRIGHT_RED)
+    fun brightGreen(text: String) = colorize(text, Color.BRIGHT_GREEN)
+    fun brightYellow(text: String) = colorize(text, Color.BRIGHT_YELLOW)
+    fun brightBlue(text: String) = colorize(text, Color.BRIGHT_BLUE)
+    fun brightMagenta(text: String) = colorize(text, Color.BRIGHT_MAGENTA)
+    fun brightCyan(text: String) = colorize(text, Color.BRIGHT_CYAN)
+    fun brightWhite(text: String) = colorize(text, Color.BRIGHT_WHITE)
+
+    // Presets
+    fun error(text: String) = colorize(text, Color.ERROR)
+    fun warn(text: String) = colorize(text, Color.WARN)
+    fun info(text: String) = colorize(text, Color.INFO)
+    fun debug(text: String) = colorize(text, Color.DEBUG)
+
+    // Bold helpers (keeping all existing ones)
+    fun boldBlack(text: String) = colorize(text, Color.BLACK.bold())
+    fun boldRed(text: String) = colorize(text, Color.RED.bold())
+    fun boldGreen(text: String) = colorize(text, Color.GREEN.bold())
+    fun boldYellow(text: String) = colorize(text, Color.YELLOW.bold())
+    fun boldBlue(text: String) = colorize(text, Color.BLUE.bold())
+    fun boldMagenta(text: String) = colorize(text, Color.MAGENTA.bold())
+    fun boldCyan(text: String) = colorize(text, Color.CYAN.bold())
+    fun boldWhite(text: String) = colorize(text, Color.WHITE.bold())
+
+    fun boldBrightBlack(text: String) = colorize(text, Color.BRIGHT_BLACK.bold())
+    fun boldBrightRed(text: String) = colorize(text, Color.BRIGHT_RED.bold())
+    fun boldBrightGreen(text: String) = colorize(text, Color.BRIGHT_GREEN.bold())
+    fun boldBrightYellow(text: String) = colorize(text, Color.BRIGHT_YELLOW.bold())
+    fun boldBrightBlue(text: String) = colorize(text, Color.BRIGHT_BLUE.bold())
+    fun boldBrightMagenta(text: String) = colorize(text, Color.BRIGHT_MAGENTA.bold())
+    fun boldBrightCyan(text: String) = colorize(text, Color.BRIGHT_CYAN.bold())
+    fun boldBrightWhite(text: String) = colorize(text, Color.BRIGHT_WHITE.bold())
+
+    // Dim helpers (keeping all existing ones)
+    fun dimBlack(text: String) = colorize(text, Color.BLACK.dim())
+    fun dimRed(text: String) = colorize(text, Color.RED.dim())
+    fun dimGreen(text: String) = colorize(text, Color.GREEN.dim())
+    fun dimYellow(text: String) = colorize(text, Color.YELLOW.dim())
+    fun dimBlue(text: String) = colorize(text, Color.BLUE.dim())
+    fun dimMagenta(text: String) = colorize(text, Color.MAGENTA.dim())
+    fun dimCyan(text: String) = colorize(text, Color.CYAN.dim())
+    fun dimWhite(text: String) = colorize(text, Color.WHITE.dim())
+
+    fun dimBrightBlack(text: String) = colorize(text, Color.BRIGHT_BLACK.dim())
+    fun dimBrightRed(text: String) = colorize(text, Color.BRIGHT_RED.dim())
+    fun dimBrightGreen(text: String) = colorize(text, Color.BRIGHT_GREEN.dim())
+    fun dimBrightYellow(text: String) = colorize(text, Color.BRIGHT_YELLOW.dim())
+    fun dimBrightBlue(text: String) = colorize(text, Color.BRIGHT_BLUE.dim())
+    fun dimBrightMagenta(text: String) = colorize(text, Color.BRIGHT_MAGENTA.dim())
+    fun dimBrightCyan(text: String) = colorize(text, Color.BRIGHT_CYAN.dim())
+    fun dimBrightWhite(text: String) = colorize(text, Color.BRIGHT_WHITE.dim())
+
+    // --------------------------------------------------------
+    // Utility functions
+    // --------------------------------------------------------
+    
+    // Create a gradient effect
+    fun gradient(text: String, startColor: Color, endColor: Color): String {
+        if (!globalColorsEnabled || text.isEmpty()) return text
+        
+        val length = text.length
+        if (length == 1) return colorize(text, startColor)
+        
+        return text.mapIndexed { index, char ->
+            val ratio = index.toFloat() / (length - 1)
+            // Simple interpolation between colors (this is a basic implementation)
+            val color = if (ratio < 0.5f) startColor else endColor
+            colorize(char.toString(), color)
+        }.joinToString("")
+    }
+    
+    // Rainbow effect
+    fun rainbow(text: String): String {
+        if (!globalColorsEnabled) return text
+        
+        val colors = listOf(
+            Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, 
+            Color.CYAN, Color.BLUE, Color.MAGENTA
+        )
+        
+        return text.mapIndexed { index, char ->
+            val colorIndex = index % colors.size
+            colorize(char.toString(), colors[colorIndex])
+        }.joinToString("")
+    }
+    
+    // Strip all ANSI codes
+    fun stripColors(text: String): String = text.replace(Regex("\u001B\\[[0-9;]*m"), "")
+    
+    // Get length without ANSI codes
+    fun getDisplayLength(text: String): Int = stripColors(text).length
+}
+

src/main/kotlin/org/kargs/OptionalOption.kt

@@ -0,0 +1,37 @@
+package org.kargs
+
+/**
+ * Option that can be used as a flag or with a value
+ */
+class OptionalOption(
+    val longName: String,
+    val shortName: String? = null,
+    description: String? = null,
+    private val defaultWhenPresent: String = "true"
+) : KargsProperty<String>(description) {
+    private var wasExplicitlySet = false
+
+    init {
+        require(longName.isNotBlank()) { "Long name cannot be blank" }
+        require(!longName.startsWith("-")) { "Long name should not start with dashes" }
+        shortName?.let {
+            require(it.length == 1) { "Short name must be exactly one character" }
+            require(!it.startsWith("-")) { "Short name should not start with dashes" }
+        }
+    }
+
+    override fun parseValue(str: String) {
+        value = str
+        wasExplicitlySet = true
+    }
+
+    /**
+     * Set as flag (no value provided)
+     */
+    fun setAsFlag() {
+        value = defaultWhenPresent
+        wasExplicitlySet = true
+    }
+
+    fun isSet(): Boolean = wasExplicitlySet
+}

src/main/kotlin/org/kargs/Parser.kt

@@ -25,6 +25,10 @@ class Parser(
      * @param args Array of command-line arguments
      */
     fun parse(args: Array<String>) {
+        if (handleVersionFlag(args)) {
+            return // Exit after showing version
+        }
+
         if (args.isEmpty()) {
             if (config.helpOnEmpty) {
                 printGlobalHelp()
@@ -32,12 +36,6 @@ class Parser(
             return
         }
 
-        // Check for global help
-        if (args.contains("--help") || args.contains("-h")) {
-            printGlobalHelp()
-            return
-        }
-
         val cmdName = args[0]
         val cmd = findCommand(cmdName)
 
@@ -49,19 +47,23 @@ class Parser(
             return
         }
 
-        // Check for command specific help
+        // Check for help, global or command
-        if (args.contains("--help") || args.contains("-h")) {
+        if ("--help" in args || "-h" in args) {
             cmd.printHelp()
             return
         }
 
+        // Check for no-color
+        if ("--no-color" in args) {
+            Colors.setGlobalColorsEnabled(false)
+        } 
+
         try {
-            parseCommandArgs(cmd, args.sliceArray(1 until args.size))
+            parseCommandArgs(cmd, args.sliceArray(1 ..< args.size))
             validateRequiredOptions(cmd)
             cmd.execute()
         } catch (e: ArgumentParseException) {
-            printError(e.message ?: "Parse error")
+            handleParseError(e, cmd)
-            cmd.printHelp()
             throw e 
         }
     }
@@ -74,7 +76,7 @@ class Parser(
         return commands.firstOrNull { cmd -> 
             val cmdName = if (config.caseSensitive) cmd.name else cmd.name.lowercase()
             val aliases = if (config.caseSensitive) cmd.aliases else cmd.aliases.map { it.lowercase() }
-            cmdName == searchName || aliases.contains(searchName)
+            cmdName == searchName || searchName in aliases
         }
     }
 
@@ -88,6 +90,9 @@ class Parser(
         while (i < args.size) {
             val arg = args[i]
 
+            if ("--help" in arg || "-h" in arg) i++
+            if ("--no-color" in arg) i++
+
             when {
                 arg.startsWith("--") -> {
                     val key = arg.removePrefix("--")
@@ -115,6 +120,7 @@ class Parser(
     private fun parseLongOption(cmd: Subcommand, key: String, args: Array<String>, index: Int): Int {
         val option = cmd.options.firstOrNull { it.longName == key }
         val flag = cmd.flags.firstOrNull { it.longName == key }
+        val optionalOption = cmd.optionalOptions.firstOrNull { it.longName == key }
 
         return when {
             option != null -> {
@@ -129,6 +135,18 @@ class Parser(
                 }
             }
 
+            optionalOption != null -> {
+                // Check if next arg exists and doesn't start with -
+                if (index + 1 < args.size && !args[index + 1].startsWith("-")) {
+                    // Has value
+                    optionalOption.parseValue(args[index + 1])
+                    index + 1
+                } else {
+                    // Used as flag
+                    optionalOption.setAsFlag()
+                    index
+                }
+            }
             flag != null -> {
                 flag.setFlag()
                 index
@@ -153,10 +171,13 @@ class Parser(
         if (key.length > 1) {
             key.forEach { char -> 
                 val flag = cmd.flags.firstOrNull { it.shortName == char.toString() }
-                if (flag != null) {
+                val optionalOption = cmd.optionalOptions.firstOrNull { it.shortName == char.toString() }
-                    flag.setFlag()
+
-                } else if (config.strictMode) {
+                when {
-                    throw ArgumentParseException("Unknown flag -$char")
+                    flag != null -> flag.setFlag()
+                    optionalOption != null -> optionalOption.setAsFlag()
+                    config.strictMode -> throw ArgumentParseException("Unknown flag -$char")
+                    else -> printWarning("Unknown flag -$char")
                 }
             }
             return index
@@ -164,6 +185,7 @@ class Parser(
 
         val option = cmd.options.firstOrNull { it.shortName == key }
         val flag = cmd.flags.firstOrNull { it.shortName == key }
+        val optionalOption = cmd.optionalOptions.firstOrNull { it.shortName == key }
 
         return when {
             option != null -> {
@@ -178,6 +200,19 @@ class Parser(
                 }
             }
 
+            optionalOption != null -> {
+                // Check if next arg exists and doesn't start with -
+                if (index + 1 < args.size && !args[index + 1].startsWith("-")) {
+                    // Has value
+                    optionalOption.parseValue(args[index + 1])
+                    index + 1
+                } else {
+                    // Used as flag
+                    optionalOption.setAsFlag()
+                    index
+                }
+            }
+
             flag != null -> {
                 flag.setFlag()
                 index
@@ -225,9 +260,22 @@ class Parser(
      */
     private fun validateRequiredOptions(cmd: Subcommand) {
         val missingRequired = cmd.options.filter { it.required && it.value == null }
+        val missingArgs = cmd.arguments.filter { it.required && it.value == null }
+
+        val errors = mutableListOf<String>()
+
         if (missingRequired.isNotEmpty()) {
             val missing = missingRequired.joinToString(", ") { "--${it.longName}" }
-            throw ArgumentParseException("Missing required options: $missing")
+            errors.add("Missing required options: $missing")
+        }
+
+        if (missingArgs.isNotEmpty()) {
+            val missing = missingArgs.joinToString(", ") { it.name }
+            errors.add("Missing required arguments: $missing")
+        }
+
+        if (errors.isNotEmpty()) {
+            throw ArgumentParseException(errors.joinToString(", "))
         }
     }
 
@@ -235,15 +283,17 @@ class Parser(
      * Print global help menu
      */
     private fun printGlobalHelp() {
-        println(colorize("Usage: $programName <command> [options]", Color.BOLD))
+        val versionInfo = config.programVersion?.let { " ${Colors.dimBlue("(v$it)")}" } ?: ""
+        println(Colors.boldWhite("Usage: $programName$versionInfo <command> [options]"))
         println()
-        println(colorize("Commands:", Color.BOLD))
+        println(Colors.boldWhite("Commands:"))
         commands.forEach { cmd -> 
             val aliases = if (cmd.aliases.isNotEmpty()) " (${cmd.aliases.joinToString(", ")})" else ""
-            println("  ${colorize(cmd.name, Color.GREEN)}$aliases")
+            println("  ${cmd.name}${Colors.dimBlue(aliases)}")
             if (cmd.description.isNotEmpty()) {
-                println("    ${cmd.description}")
+                println(Colors.dimMagenta("    ${cmd.description}"))
             }
+            println()
         }
         println()
         println("Use `$programName <command> --help` for more information about a command.")
@@ -253,36 +303,57 @@ class Parser(
      * Print error message with optional coloring
      */
     private fun printError(message: String) {
-        println(colorize("Error: $message", Color.RED))
+        println(Colors.error("Error: $message"))
     }
 
     /**
      * Print warning message with optional coloring
      */
     private fun printWarning(message: String) {
-        println(colorize("Warning: $message", Color.YELLOW))
+        println(Colors.warn("Warning: $message"))
     }
 
     /**
-     * Apply color to text if colors are enabled
+     * Handles parse errors
+     *
+     * @throw ArgumentParseException if in debug mode
      */
-    private fun colorize(text: String, color: Color): String {
+    private fun handleParseError(e: ArgumentParseException, cmd: Subcommand) {
-        return if (config.colorsEnabled) {
+        printError(e.message ?: "Parse error")
-            "${color.code}$text${Color.RESET.code}"
+        cmd.printHelp()
-        } else {
+
-            text
+        // Only show stack trace in debug mode
+        if (System.getProperty("debug") == "true") {
+            e.printStackTrace()
         }
+
+        // Exit gracefully instead of throwing
+        // kotlin.system.exitProcess(1)
     }
 
     /**
-     * ANSI color codes for terminal output
+     * Check if version flag is present and handle it
      */
-    private enum class Color(val code: String) {
+    private fun handleVersionFlag(args: Array<String>): Boolean {
-        RESET("\u001B[0m"),
+        if (config.programVersion == null) return false
-        RED("\u001B[31m"),
+
-        GREEN("\u001B[32m"),
+        val versionFlags = listOf("--${config.versionLongName}", "-${config.versionShortName}")
-        YELLOW("\u001B[33m"),
+
-        BOLD("\u001B[1m")
+        if (args.any { it in versionFlags }) {
+            printVersion()
+            return true // Indicates version was shown, should exit
+        }
+
+        return false
+    }
+
+    /**
+     * Print version information
+     */
+    private fun printVersion() {
+        config.programVersion?.let { version -> 
+            println("$programName version $version")
+        }
     }
 }
 

src/main/kotlin/org/kargs/ParserConfig.kt

@@ -9,9 +9,17 @@ data class ParserConfig(
     val helpOnEmpty: Boolean = true, // Show help when no args provided
     val caseSensitive: Boolean = true,
     val allowAbbreviations: Boolean = false, // Allow partial option matching
-    val programVersion: String? = null // Adds --version and -v flag if set
+    val programVersion: String? = null, // Adds --version and -v flag if set
+
+    // Optional customize version flag names
+    val versionLongName: String = "version",
+    val versionShortName: String = "V" // Capital V to avoid conflicts with -v (verbose)
 ) {
     companion object {
         val DEFAULT = ParserConfig()
     }
+
+    init {
+        Colors.setGlobalColorsEnabled(colorsEnabled)
+    }
 }

src/main/kotlin/org/kargs/Subcommand.kt

@@ -16,6 +16,7 @@ abstract class Subcommand(
     private val _options = mutableListOf<Option<*>>()
     private val _flags = mutableListOf<Flag>()
     private val _arguments = mutableListOf<Argument<*>>()
+    private val _optionalOptions = mutableListOf<OptionalOption>()
 
     init {
         require(name.isNotBlank()) { "Subcommand name cannot be blank" }
@@ -30,6 +31,7 @@ abstract class Subcommand(
             is Option<*> -> _options += prop
             is Flag -> _flags += prop
             is Argument<*> -> _arguments += prop
+            is OptionalOption -> _optionalOptions += prop
         }
     }
 
@@ -37,6 +39,7 @@ abstract class Subcommand(
     val options: List<Option<*>> get() = _options
     val flags: List<Flag> get() = _flags
     val arguments: List<Argument<*>> get() = _arguments
+    val optionalOptions: List<OptionalOption> get() = _optionalOptions
 
     /**
      * Execute this subcommand - must be implemented by subclasses
@@ -47,47 +50,67 @@ abstract class Subcommand(
      * Print help information for this subcommand
      */
     fun printHelp() {
-        println("Usage: $name [options]${if (arguments.isNotEmpty()) " ${arguments.joinToString(" ") { "<${it.name}>" }}" else ""}")
+        println(Colors.boldWhite("Usage: $name ${"[options]"}${if (arguments.isNotEmpty()) " ${arguments.joinToString(" ") { if (it.required) "<${it.name}>" else "[${it.name}]" }}" else ""}"))
+
         if (description.isNotEmpty()) {
             println()
-            println(description)
+            println(Colors.boldMagenta(description))
         }
 
         if (options.isNotEmpty()) {
             println()
-            println("Options:")
+            println(Colors.boldWhite("Options:"))
             options.forEach { option ->
                 val shortName = option.shortName?.let { "-$it, " } ?: "    "
-                val required = if (option.required) " (required)" else ""
+                val required = if (option.required) Colors.dimBlue(" (required)") else ""
-                val defaultVal = option.getValueOrDefault()?.let { " [default: $it]" } ?: ""
+                val defaultVal = option.getValueOrDefault()?.let { Colors.boldBlue(" [default: $it]") } ?: ""
-                println("  $shortName--${option.longName}")
+                val typeInfo = Colors.yellow(getTypeInfo(option.type))
+
+                println("  $shortName--${option.longName}${typeInfo}")
                 option.description?.let { desc ->
-                    println("        $desc$required$defaultVal")
+                    println(Colors.dimMagenta("        $desc$required$defaultVal"))
                 }
+                println()
+            }
+        }
+
+        if (optionalOptions.isNotEmpty()) {
+            println()
+            println(Colors.boldWhite("Optional Value Options:"))
+            optionalOptions.forEach { option ->
+                val shortName = option.shortName?.let { "-$it, " } ?: "    "
+                println("  $shortName--${option.longName} [value]")
+                option.description?.let { desc ->
+                    println(Colors.dimMagenta("        $desc (can be used as flag or with value)"))
+                }
+                println()
             }
         }
 
         if (flags.isNotEmpty()) {
             println()
-            println("Flags:")
+            println(Colors.boldWhite("Flags:"))
             flags.forEach { flag ->
                 val shortName = flag.shortName?.let { "-$it, " } ?: "    "
                 println("  $shortName--${flag.longName}")
                 flag.description?.let { desc ->
-                    println("        $desc")
+                    println(Colors.dimMagenta("        $desc"))
                 }
+                println()
             }
         }
 
         if (arguments.isNotEmpty()) {
             println()
-            println("Arguments:")
+            println(Colors.boldWhite("Arguments:"))
             arguments.forEach { arg ->
-                val required = if (arg.required) " (required)" else " (optional)"
+                val required = Colors.dimBlue(if (arg.required) " (required)" else " (optional)")
-                println("  ${arg.name}$required")
+                val typeInfo = Colors.yellow(getTypeInfo(arg.type))
+                println("  ${arg.name}$typeInfo$required")
                 arg.description?.let { desc ->
-                    println("    $desc")
+                    println(Colors.dimMagenta("    $desc"))
                 }
+                println()
             }
         }
     }
@@ -107,4 +130,20 @@ abstract class Subcommand(
 
         return errors
     }
+
+    /**
+     * Type info helper method
+     */
+    private fun getTypeInfo(type: ArgType<*>): String {
+        return when (type) {
+            is ArgType.StringType -> " <string>"
+            is ArgType.IntType -> " <int>"
+            is ArgType.DoubleType -> " <double>"
+            is ArgType.BooleanType -> " <bool>"
+            is ArgType.IntRange -> " <${type.min}-${type.max}>"
+            is ArgType.Choice -> " <${type.choices.joinToString("|")}>"
+            is ArgType.OptionalValue -> " [string]"
+            is ArgType.FilePath -> " <path>"
+        }
+    }
 }

src/test/kotlin/org/kargs/tests/ArgTypeTest.kt

@@ -7,6 +7,8 @@ import org.junit.jupiter.params.provider.ValueSource
 import org.kargs.ArgType
 import org.kargs.ArgumentParseException
 import kotlin.test.assertEquals
+import kotlin.io.path.createTempFile
+import kotlin.io.path.createTempDirectory
 
 class ArgTypeTest {
 
@@ -103,5 +105,192 @@ class ArgTypeTest {
         val type = ArgType.choice("apple", "banana", "cherry")
         assertEquals("one of: apple, banana, cherry", type.getValidationDescription())
     }
+
+    @Test
+    fun `FilePath converts string to File`() {
+        val type = ArgType.filePath()
+        val result = type.convert("/path/to/file.txt")
+        assertEquals("/path/to/file.txt", result.path)
+    }
+
+    @Test
+    fun `FilePath with no constraints allows any path`() {
+        val type = ArgType.filePath()
+        // Should not throw for non-existent files
+        val result = type.convert("/non/existent/path")
+        assertEquals("/non/existent/path", result.path)
+        assertEquals(true, type.validate(result))
+    }
+
+    @Test
+    fun `existingFile validates file exists and is file`() {
+        val type = ArgType.existingFile()
+
+        // Create a temporary file for testing
+        val tempFile = kotlin.io.path.createTempFile().toFile()
+        tempFile.writeText("test content")
+
+        try {
+            // Should work with existing file
+            val result = type.convert(tempFile.absolutePath)
+            assertEquals(true, type.validate(result))
+
+            // Should fail with non-existent file
+            val nonExistent = type.convert("/non/existent/file.txt")
+            assertEquals(false, type.validate(nonExistent))
+
+        } finally {
+            tempFile.delete()
+        }
+    }
+
+    @Test
+    fun `existingFile fails validation on directory`() {
+        val type = ArgType.existingFile()
+
+        // Create a temporary directory
+        val tempDir = kotlin.io.path.createTempDirectory().toFile()
+
+        try {
+            val result = type.convert(tempDir.absolutePath)
+            assertEquals(false, type.validate(result)) // Should fail because it's a directory, not a file
+
+        } finally {
+            tempDir.delete()
+        }
+    }
+
+    @Test
+    fun `existingDirectory validates directory exists and is directory`() {
+        val type = ArgType.existingDirectory()
+
+        // Create a temporary directory
+        val tempDir = kotlin.io.path.createTempDirectory().toFile()
+
+        try {
+            // Should work with existing directory
+            val result = type.convert(tempDir.absolutePath)
+            assertEquals(true, type.validate(result))
+
+            // Should fail with non-existent directory
+            val nonExistent = type.convert("/non/existent/directory")
+            assertEquals(false, type.validate(nonExistent))
+
+        } finally {
+            tempDir.delete()
+        }
+    }
+
+    @Test
+    fun `existingDirectory fails validation on file`() {
+        val type = ArgType.existingDirectory()
+
+        // Create a temporary file
+        val tempFile = kotlin.io.path.createTempFile().toFile()
+        tempFile.writeText("test")
+
+        try {
+            val result = type.convert(tempFile.absolutePath)
+            assertEquals(false, type.validate(result)) // Should fail because it's a file, not a directory
+
+        } finally {
+            tempFile.delete()
+        }
+    }
+
+    @Test
+    fun `readableFile validates file is readable`() {
+        val type = ArgType.readableFile()
+
+        // Create a temporary file
+        val tempFile = kotlin.io.path.createTempFile().toFile()
+        tempFile.writeText("test content")
+
+        try {
+            // Should work with readable file
+            val result = type.convert(tempFile.absolutePath)
+            assertEquals(true, type.validate(result))
+
+            // Make file unreadable (this might not work on all systems)
+            tempFile.setReadable(false)
+            assertEquals(false, type.validate(result))
+
+        } finally {
+            tempFile.setReadable(true) // Restore permissions
+            tempFile.delete()
+        }
+    }
+
+    @Test
+    fun `writableFile validates file is writable`() {
+        val type = ArgType.writableFile()
+
+        // Create a temporary file
+        val tempFile = kotlin.io.path.createTempFile().toFile()
+        tempFile.writeText("test content")
+
+        try {
+            // Should work with writable file
+            val result = type.convert(tempFile.absolutePath)
+            assertEquals(true, type.validate(result))
+
+            // Make file read-only (this might not work on all systems)
+            tempFile.setWritable(false)
+            assertEquals(false, type.validate(result))
+
+        } finally {
+            tempFile.setWritable(true) // Restore permissions
+            tempFile.delete()
+        }
+    }
+
+    @Test
+    fun `FilePath validation description includes constraints`() {
+        assertEquals("file path", ArgType.filePath().getValidationDescription())
+        assertEquals("file path (must exist, must be a file)", ArgType.existingFile().getValidationDescription())
+        assertEquals("file path (must exist, must be a directory)", ArgType.existingDirectory().getValidationDescription())
+        assertEquals("file path (must exist, must be a file, must be readable)", ArgType.readableFile().getValidationDescription())
+        assertEquals("file path (must be writable)", ArgType.writableFile().getValidationDescription())
+    }
+
+    @Test
+    fun `FilePath with multiple constraints`() {
+        val type = ArgType.FilePath(
+            mustExist = true,
+            mustBeFile = true,
+            mustBeReadable = true,
+            mustBeWritable = true
+        )
+
+        val tempFile = kotlin.io.path.createTempFile().toFile()
+        tempFile.writeText("test")
+
+        try {
+            val result = type.convert(tempFile.absolutePath)
+            assertEquals(true, type.validate(result))
+
+            assertEquals(
+                "file path (must exist, must be a file, must be readable, must be writable)",
+                type.getValidationDescription()
+            )
+
+        } finally {
+            tempFile.delete()
+        }
+    }
+
+    @Test
+    fun `FilePath handles non-existent parent directories`() {
+        val type = ArgType.writableFile()
+
+        // Path with non-existent parent directory
+        val result = type.convert("/non/existent/parent/file.txt")
+
+        // Should convert fine (validation happens separately)
+        assertEquals("/non/existent/parent/file.txt", result.path)
+
+        // Validation should fail because parent doesn't exist
+        assertEquals(false, type.validate(result))
+    }
 }